PowerManagement: improved macros for selecting RAM regions
updated all file headers to 2019
Removed modules/flash.mk since flashing procedures highly depend on hardware.
Introduced a new module: STM32F4Discovery
all halconf.h files: removed redundant HAL_USE_QEU settings
Introduced a switch to completely disable SSSP (thanks to S. Welzel)
Added ChibiOS license handling to the makefiles.
Minor fixes and enhancements.
removed ChibiOS dependencies from build-tree: C++ wrappers and shell
Removed the extension of the optional BUILDDIR variable in the module makefiles.
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